Improvement in nut-tapping machines



Patentedjuly 8,1873.'

al WPufmzmn/ g @if rn S r.. v n j... Ww. M c a W MM v. I g m `U n, m Pi M p H w u T T.l r. Y .,I n A S u L *a N f 7. 7. .W Afr 2 F I 7 01 L QU, E 4 V State of Massachusetts, have invented a new UNITED STATES f SALMON PUTNAM, JR., OF FITOHBURG, MASSACHUSETTS.

IMPROVEMENT IN NUTTAPFlING MACHlNES.

Specification forming part of Letters Patent No. 140,727, dated July S, 1873; application file April 11, 1873.

To all whom it may concern:

Be it known that I, SALMON W. PUTNAM, Jr., of Fitchburg, of the county of Worcester and and useful Improvement in Nut-Tapping Machines; and do hereby declare the same to be fully described in the following speeiiication and represented in the accompanying drawings, ci' which- Figure l is a top View; Fig. 2, a rear elevation; Fig. 3, a horizontal section; and Figs. 4 and 5 are vertical sections, of a nut-tapping machine as improved by me. Fig. 6 is a side view; Fig. 7, a front-end view; Fig. 8, a rearend view and Fig. 9, a longitudinal section, of the tubular bushing77 to be hereinafter explained. Fig. 10 is a top view, and Fig. 11 a side view, of the tapping-tool.

My invention relates, first, to the combination of an eccentric carrier crtube with the tapping-tool arbor, its drivin ggear, pinion, and head-stock; second, to three arbors, their driving-gears and pinion arranged together and with the head-stock, in manner as hereinafter explained third, to the combination of an auxiliary gear and its carrier with two oi' the arbors and their drivin g-gears and eccentric carriers; fourth, to a tubular bushing for the tappin g-tool and its arbor-that is, to such bushing constructed with aprismatic holder at its inner end, and with a hole arranged in its side, all' being as and for use as hereinafter eX- plained; fifth, to the bushing so made, the arbor and the clamp-screw arranged as set forth and shown.

In the drawings, A denotes a head-stock, provided with three arbors, B, G, and D, arranged within it and parallel to each other, as shown, there being a driving-gear, E, F, or G, Xed on the rear end of each of said arbors. The two outermost gears E G lap over and are disposed in the rear of, and each is of greater diameter than, the other gear F. A single driving-pinion, H, fixed upon a shaft, I, provided with driving-pulleys K K K, is ar ranged between the gears E and G, and extends underneath the gear F and engages with the three gears. Each of the arbors goes lengthwise through, so as to be supported by and be capable of being revolved within a cyl-. nder or tube, L, whose bore is eccentric to its periphery. Such cylinder or eccentric carrier, as it may be termed, is supported in a cylindrical bearing, m, in the head-stock, and is provided with a handle, a, which extends from it in manner as shown. y

By taking hold of the handle and moving it so as to revolve or turn the eccentric carrier in the head-stock, the driving-gear of its arbor may be thrown out of or be moved into engagement with the driving-pinion. Thus it will be seen that when it may be desirable to arrest the motion of either of the arbors, this may be done without at the same time causing any stoppage of motion ol" the others. This arrest oi motion of either arbor has to be effected whenever the shank of its tappingtool may have become filled with nuts, in which case the tapping-tool has to be with drawn from its holder for the nuts to be discharged from the shank of the tool.

But one tapping-tool is shown in the drawings. Each of the arbors are to be supposed to be supplied with one. This tool is shown at M, constructed in the ordinary way, except that its shank b at its rear part is provided with a prislnatic tenon, c, to enter a correspondin g cavity or holder, d, made in the rear end of atubular bushing, N, in whose side a hole, e, is formed to receive a set-screw, f, when screwed laterally into the arbor.

The bushi ng inserted in the arbor, andformed as shown, will be held therein by the setscrew, which, going through the hole e and being screwed against the shank b, will operate not only to hold the bushing but the tapping-tool in place in the arbor. The tenon oi' the shank and the corresponding holder in the bushing operate to prevent the shank from turning within thebushing. As the tappingtools vary in size according to the nuts required to be made, each tool, in order to properly centralize it with the arbor, has to have its bushing to iix it in the arbor.

The middle arbor with its gear will run at a greater speed than either of the other arbors, thus enabling nuts with finer screw-threads to be cut at the same time that nuts are being made or tapped by the tools of the other or larger arbors. Furthermore, as it may be derections in order for left screw-nuts to be tapped by the tool of one, while right screwnuts may be in the act of being tapped by the tool of the other, there is pivoted on the shaft of the driving-pinion a pendulous or radial arm, O, slotted, as shown at h, and carrying upon a pivot, fi, (projecting from it,) a small gear, P, engaging with the pinion, and arranged in the plane of the two larger gears E and G. A clamp-screw, k, goes through the slot h and screws into the head-stock.

By turning the eccentric carrier L of either arbor B D, so as to throw the driving-gear of such arbor out of engagement with the driving-pinion, and next moving the auxiliary gear P into engagement with the said driving-gear, the rotary motion of one arbor will be in a direction opposite to that of the other while the two may be in movement.

I claim as my invention in the above-described nut-tappin g machinery as follows, viz.

l. The combinationas specified, of the eccentric carrier L with the tappingtool arbor, L

2. The combination of the auxiliary gear P and its slitted carrier or pendulous arm O with the two driving-gears E G and the eccentric carriers L L applied to the head-stock andthe arbors of such gears, all being essentially as explained.

3. The tubular bushing N provided with the prismatic mortise or holder d and the hole e arranged in it, as described.

4. The combination of the bushing N, (so made or provided, viz., With the holder d and hole 0,) the arbor D, and the clamp-screw f, all arranged and to operate together and with the tapping-tool, as represented.

SALMON W. PUTNAM, JR.

Witnesses HENRY O. PUTNAM, LoRING SEARS. 

